Mine Refuge Chamber – “A Safe Haven”

ON2 designs, builds, supplies and services “The TommyKnocker” mobile mine refuge chamber for the underground “Hard Rock” mining industry. During a mine emergency and evacuation, The TommyKnocker is a safe haven for miners who await rescue. The chamber is easy to move and relocate in underground mining applications making it more accessible to miners. It typically includes the ON2 “Refuge One Air Centre”, making it a complete mine refuge system. The TommyKnocker’s rugged yet simple design provides operational availability when you need it.


  • Portable design allows for ease of transport
  • Can be hoisted, dragged, rolled, or forklifted
  • Double door entry system for control of outside air
  • Positive air pressure minimizes outside air ingress into chamber
  • Comfortable bench seating for chamber occupants
  • Storage area for consumables in cabinets and under seat
  • Sectioned off area for toilet
  • Split system 230VAC air conditioner minimizes power consumption
  • Leak tested to ensure airtight compartments
  • Reflective signage allows recognition in poor lit conditions
  • Rugged 12-gauge steel construction
  • Dimmable LED lighting throughout
  • Water and Food storage provided
  • Occupancy beacon and siren allows rescuers to locate easily

ADDITIONAL OPTIONS – available upon request

  • Mine compressed air supply
  • Carbon Monoxide scrubber unit
  • Portable gas monitor
  • Up to 96-hour battery capacity
MODELS 10 – 20 person
DIMENSIONS W 7’4” x H 7’3” x L 14’ – 24’
COMPOSITION 12-gauge steel throughout
COATING Epoxy primed, urethane coated
SEATING Padded benches
AIR LOCK 4’ chamber with positive air pressure
LIGHTING 12 VDC dimmable led lighting strips
ELECTRICAL 115 VAC for connection to mine supply

12 VDC without mine supply (36 – 96 hour capacity)

CAPACITY 36-96 hour operation depending on sodalime supply
OXYGEN SUPPLY “K” size bottles matching capacity of sodalime


TOILET Self-contained 20 litre
FIRST AID KIT Standard kit supplied
WATER DISPENSER 26 litre container supplied
BATTERY CHARGER 12 VDC system for 36, 48, 72, 96 hours


AIR CONDITIONER o   12,000 or 18,000 BTU split unit available

o   variable speed system to improve battery life

MINE AIR SUPPLY o   connection to mine compressed air

o   filters supplied to purify air

o   purge drain supplied

o   pressure regulator included

o   muffler included

CO CATALYZER One time use to reduce co in refuge chamber
COMMUNICATION CENTRE Custom designed communication centre to meet Mine’s requirements

Please contact us for more information regarding service parts.